I can't believe no one answered this
I found a strategy while fighting someone on Pokemon Showdown
Try this (Works best with double toxic spikes on)

Gen V

Gliscor (M/F) @ Toxic Orb

Trait: Poison Heal

EVs: 252 Attk / 4 SpDef / 252 Spd

Jolly Nature (+Spd, -SAttk)

Earthquake - STAB

Ice Fang - Gets rid of those flying types and the levitators

Protect - See Below

Substitute - See Below

To use this, first get a burn, poison or badly poison on the target. Then comes the ultimate stalling since you outspeed most Pokemon in OU (non-scarfed). Use Protect, and Toxic Orb turns on. Use Substitute, then the substitute presumably dies. Afterwards. use protect again. Keep repeating and bring chips/popcorn while watching your opponent die.

IF your Substitute doesn't get destroyed, or if you have no Burn or Poison or Badly Poison on your target, this is when E-quake and I-Fang come in. Use E-quake after a sub that's not yet destroyed. Use Ice Fang instead of E-Quake when it's obvious (Like fighting a Flying type, or something else). If you have no Burn/Poison/Badly Poison, keep stalling either till Substitute doesn't get destroyed and you can use E-Quake/I-Fang OR until your opponent runs out of PP or switches out. If your opponent misses on your Sub, you can also attack.

however you can include fire fang and sunny day (or) ice fang and cross poison (or)
dig hunderd percent safe move cause it wont affect moves like magnitude and esrth quake
because of the fact that glisgor is a flying type. moves like sword dance and rock polish would also be helpfull.

Basically, on the first turn I would use protect so the toxic orb will poison Gliscor. Then I would use Substitute. Since Substitute looses 1/4 of your HP and Poison Heal heals 1/8 of your HP you'll regain you're starting health back if you use protect after substitute.
Earthquake/Stone Edge is your choice if you want STAB of want to hit flying types.
Toxic is to help stall and knock off is to hit flying types if you chose earthquake.